已知点A（2，4），B（6，﹣4），点P在直线3x﹣4y+3=0上，若满足PA2+PB2=λ的点P有且仅有1个，则实数λ的值为_1．

题干

已知点A（2，4），B（6，﹣4），点P在直线3x﹣4y+3=0上，若满足PA²+PB²=λ的点P有且仅有1个，则实数λ的值为____．

上一题下一题 0.0难度选择题更新时间:2019-05-15 09:56:39

58

阅读短文，回答问题

话题	体裁	词数	难度	建议用时
征文	广告	143	★★	4分钟

Articles Wanted

My Story

◆Articles should be typewritten (打印的), using only one side of the page.

◆Your name, year of birth, school name (and coaching teacher), home address and e-mail address must be included.

◆For photos, write the information on the back of each envelope: PLEASE DON’T FOLD(折叠).

◆Please keep copies of your texts, pictures or photos.

◆The sentence MUST BE WRITTEN with your name at the end of each article, “I promise the above work is completely original (原创的). ”

◆If your article is chosen, it will be put on China Daily and you will get a special gift.

SEND IT ALL SUMMER!

For more information, please contact (联系) us!

Tel: (010) 92136116

Fax: (010) 92674363

E-mail: mydream@chinadaily. com. cn

Mail: My dream. Box 6161, Beijing, China